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The Mozilla Toolkit is a set of APIs, built on top of Gecko, which provide advanced services to XUL applications. These services include Profile Management, Chrome Registration, Browsing History, Extension and Theme Management, Application Update Service, and Safe Mode. (More info)

Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.9a1) Gecko/20051114 Firefox/1.6a1 ID:2005111422
WFM. From the six extensions you mention I have NTT and Anidisable, so one (or more) of the other four may be the culprit.
Or else a new profile will likely solve the problem.